Anti-backflow intelligent water meter based on pressure sensor

Abstract

The invention discloses an anti-backflow intelligent water meter based on a pressure sensor, and particularly relates to the field of intelligent water meters, the anti-backflow intelligent water meter comprises a shell, a dial plate is fixedly mounted at the top of the shell, metering equipment is arranged at the top of the dial plate, one side of the shell is communicated with a water inlet pipe, the other side of the shell is communicated with a water outlet pipe, and an impeller is arranged in the shell; the layered water blocking mechanism is arranged, when water stops entering the water inlet pipe, a water baffle is stressed to move back to drive a plurality of structures to be attached to one another to form a vertical circular face to seal the water outlet pipe, and the influence on the aspect of water meter detection caused by reverse backflow of water on one side of the water outlet pipe is avoided; after water flowing in the shell is stopped, the heavy block is driven to enable the through groove in the heavy block to be communicated with the interior of the shell, so that residual water in the shell can be conveniently and rapidly discharged, and secondary influence on water meter detection caused by shaking and flowing of the residual water in the water meter when water in the water meter is cut off is avoided.

Description

Technical Field

[0001] This invention relates to the field of smart water meter technology, and more specifically, to a backflow prevention smart water meter based on a pressure sensor. Background Technology

[0002] Currently, most water meters on the market have an inlet at one end and an outlet at the other, with a dial at the top and a valve at the outlet to control the flow of water. The structure of water meters on the market usually consists of a casing and an impeller box, impeller, gear box, impeller metering mechanism, and filter screen inside the casing.

[0003] However, traditional smart water meters based on pressure sensors lack a structure to prevent internal water backflow when the water supply is interrupted. That is, inside the water meter, when the water flow is interrupted, there is no structure to block the water at the front end in time. As a result, the water that has already flowed through the outlet pipe flows back into the water meter after the water flow is interrupted, which affects the water meter's detection. Meanwhile, existing technologies do not have a structure that can promptly drain the residual water inside the water meter when the water supply is interrupted. This means that the secondary impact of the residual water inside the water meter sloshing and flowing on the water meter's detection cannot be prevented when the water supply is interrupted.

[0004] To address the aforementioned technical shortcomings, a solution is provided. Summary of the Invention

[0005] This invention provides a backflow-prevention smart water meter based on a pressure sensor to solve the technical problems mentioned in the background art, namely, the lack of a structure in existing smart water meters that can prevent internal water backflow when the water supply is interrupted, and the absence of a structure in existing technologies that can promptly discharge residual water inside the water meter when the water supply is interrupted.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a backflow prevention smart water meter based on a pressure sensor, comprising a housing, a dial fixedly mounted on the top of the housing, a metering device disposed on the top of the dial, an inlet pipe connected to one side of the housing, an outlet pipe connected to the other side of the housing, an impeller disposed inside the housing, and layered water-blocking mechanisms disposed on both sides of the housing. The layered water-blocking mechanisms allow water flow from the inlet pipe to open one side of the outlet pipe, and simultaneously close one side of the outlet pipe due to the loss of pressure when the water flow in the inlet pipe stops. A drainage mechanism is disposed at the bottom of the housing, which can be directly opened and connected to the bottom of the housing and the outside after the water flow in the inlet pipe stops, allowing residual water inside the housing to be directly discharged.

[0007] In a preferred embodiment, the layered water-blocking mechanism includes a retaining rod fixedly installed on the inner wall of the inlet pipe. A sleeve is fixedly installed at the bottom of the retaining rod. The sleeve is horizontally positioned. A support spring is fixedly installed on the inner wall of the sleeve. A push-retracting rod is fixedly installed on one side of the support spring. The push-retracting rod is slidably installed on the inner wall of the sleeve. The push-retracting rod is horizontally positioned. A baffle plate is fixedly installed on one side of the push-retracting rod. The baffle plate is vertically positioned, and the area of ​​the baffle plate is the same as the vertical cross-sectional area of ​​the inner wall of the inlet pipe.

[0008] In a preferred embodiment, a first toothed rod is fixedly installed on one side of the baffle plate. The first toothed rod is horizontally positioned, and a gear meshes with the bottom of the first toothed rod. The gear is rotatably installed on the inner wall of the housing. A second toothed rod meshes with the bottom of the gear. The second toothed rod is horizontally positioned.

[0009] In a preferred embodiment, a sliding push rod is fixedly installed on one side of the second rack, the sliding push rod is slidably installed on the inner wall of the housing, the sliding push rod is T-shaped and vertical, and a push rod is fixedly installed on one side of the sliding push rod, the push rod is horizontal.

[0010] In a preferred embodiment, a top sealing plate is fixedly installed on one side of the push rod. The top sealing plate is circular. A first sealing plate is provided on one side of the top sealing plate. The first sealing plate is vertically arranged and annular. The inner wall of the first sealing plate and the outer wall of the top sealing plate are mutually engaged. A second sealing plate is provided on one side of the first sealing plate. The second sealing plate is annular. The inner wall of the second sealing plate and the outer wall of the first sealing plate are mutually engaged. A third sealing plate is provided on one side of the second sealing plate. The third sealing plate is annular. The inner wall of the third sealing plate and the outer wall of the second sealing plate are mutually engaged.

[0011] In a preferred embodiment, a rubber sealing ring is provided on one side of the third sealing plate. The inner wall of the rubber sealing ring is configured to cooperate with the outer wall of the third sealing plate. The outer wall of the rubber sealing ring is configured to fit against the inner wall of the water outlet pipe. Sliding rods are provided between the top sealing plate, the first sealing plate, the second sealing plate, the third sealing plate, and the rubber sealing ring. The sliding rods are arranged in a ring at equal intervals. The length of the sliding rods is greater than the distance between the top sealing plate, the first sealing plate, the second sealing plate, the third sealing plate, and the rubber sealing ring. A fixing plate is provided on the outer wall of the rubber sealing ring. The fixing plate is fixedly installed on the inner wall of the water outlet pipe. The fixing plate and the outer wall of the rubber sealing ring are arranged in an alternating manner.

[0012] In a preferred embodiment, the drainage mechanism includes an opening at the bottom of the housing, the bottom of which is connected to a drainage channel. The drainage channel is vertically downward. A weight is slidably mounted on the inner wall of the drainage channel. The top of the weight is flush with the bottom of the housing. A through groove is formed on the inner wall of the weight, the top of which extends through both sides of the top of the weight. A ring pad is provided at the bottom of the weight. The ring pad is fixedly mounted on the inner wall of the drainage channel, and the top of the ring pad is in contact with the bottom of the weight. A sealing gasket is fixedly mounted on the inner wall of the opening at the bottom of the housing, and the sealing gasket is in contact with the outer wall of the weight.

[0013] In a preferred embodiment, two belt hooks are fixedly installed on the top two sides of the weight, the two belt hooks are arranged symmetrically to each other and are arranged in an inverted L shape. A lifting plate is provided on one side of the two belt hooks, the top of the two lifting plates is arranged in a sloping shape, the two lifting plates and the two belt hooks are arranged to cooperate with each other, and a belt fixing strip is fixedly installed on the outer wall of the two lifting plates. The belt fixing strip is fixedly installed on the bottom outer wall of the first rack. The distance between the lifting plate and the belt hook is less than the length of the meshing part of the first rack and the gear.

[0014] The technical effects and advantages of this invention are as follows: 1. This invention, by setting up a layered water-blocking mechanism, opens one side of the inlet pipe and one side of the outlet pipe simultaneously when water is continuously entering the inlet pipe due to water pressure. When the inlet pipe stops entering water, the baffle plate moves back under force, causing the top sealing plate, first sealing plate, second sealing plate, third sealing plate and rubber sealing ring on the outlet pipe to stick together to form a vertical circular surface, which is attached to the inner wall of the outlet pipe, thereby sealing the outlet pipe and preventing water from flowing back on one side of the outlet pipe and affecting the water meter detection.

[0015] 2. Simultaneously, by setting up a drainage mechanism, after the water flow inside the housing stops and the first toothed rod moves back, it drives the fixed strip to move the two clamping hooks on both sides synchronously. The clamping hooks on both sides approach each other and are pushed up by their inclined surfaces. Then, the two clamping hooks drive the weight to move upward, and the weight extends into the bottom of the housing. At the same time, the through groove inside the weight is connected to the inside of the housing, which facilitates the rapid discharge of residual water inside the housing and avoids the secondary impact of the residual water inside the water meter on the water meter detection when the water is cut off. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is an internal front view of the present invention.

[0018] Figure 3This is a vertical sectional view of the layered water-blocking mechanism in this invention.

[0019] Figure 4 This is a partial vertical sectional view of the layered water-blocking mechanism in this invention.

[0020] Figure 5 This is a partial cross-sectional view of the layered water-blocking mechanism in this invention.

[0021] Figure 6 This is a schematic diagram of the drainage mechanism in this invention.

[0022] Figure 7 For the present invention Figure 6 Enlarged view of the structure of part A.

[0023] The attached figures are labeled as follows: 1. Housing; 2. Dial; 3. Metering device; 4. Inlet pipe; 5. Outlet pipe; 6. Impeller; 7. Layered water-blocking mechanism; 71. Fixing rod; 72. Sleeve; 73. Support spring; 74. Push rod; 75. Water baffle; 76. First rack; 77. Gear; 78. Second rack; 79. Sliding push rod; 710. With push rod; 711. Top sealing plate; 712. First sealing plate; 713. Second sealing plate; 714. Third sealing plate; 715. Rubber sealing ring; 716. Sliding rod; 717. Fixing plate; 8. Drainage mechanism; 81. Drainage slot; 82. Weight; 83. Through slot; 84. Ring gasket; 85. Sealing gasket; 86. Belt hook; 87. Lifting plate; 88. Fixing strip. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 Traditional pressure sensor-based smart water meters lack a structure to prevent internal water backflow during water outages. This means that when the water flow stops, the absence of a mechanism to promptly block the flow allows water that has already passed through the outlet pipe to flow back into the meter, impacting its performance. To address this issue, the following technical solution is proposed: Refer to the instruction manual appendix Figures 1-7 A backflow prevention smart water meter based on a pressure sensor, such as Figure 1 and Figure 2As shown, the device includes a housing 1, a dial 2 fixedly mounted on the top of the housing 1, a metering device 3 mounted on the top of the dial 2, an inlet pipe 4 connected to one side of the housing 1, an outlet pipe 5 connected to the other side of the housing 1, an impeller 6 installed inside the housing 1, and layered water blocking mechanisms 7 installed on both sides of the housing 1. The layered water blocking mechanism 7 can open one side of the outlet pipe 5 when water flows into the inlet pipe 4, and simultaneously close one side of the outlet pipe 5 when the water flow in the inlet pipe 4 stops due to the loss of pressure. A drainage mechanism 8 is installed at the bottom of the housing 1. The drainage mechanism 8 can be opened directly after the water flow in the inlet pipe 4 stops, connecting the bottom of the housing 1 to the outside, so that the residual water in the housing 1 can be directly discharged.

[0026] like Figure 2 and Figure 3 As shown, the layered water-blocking mechanism 7 includes a retaining rod 71 fixedly installed on the inner wall of the water inlet pipe 4. A sleeve 72 is fixedly installed at the bottom of the retaining rod 71. The sleeve 72 is set in a horizontal state. A support spring 73 is fixedly installed on the inner wall of the sleeve 72. A push rod 74 is fixedly installed on one side of the support spring 73. The push rod 74 is slidably installed on the inner wall of the sleeve 72. The push rod 74 is set in a horizontal state. A baffle plate 75 is fixedly installed on one side of the push rod 74. The baffle plate 75 is set in a vertical state. The area of ​​the baffle plate 75 is the same as the vertical cross-sectional area of ​​the inner wall of the water inlet pipe 4. When water continuously enters through the inlet pipe 4, the water flow and pressure push the baffle plate 75, causing the baffle plate 75 to move forward under force, which in turn drives the push rod 74 and stretches the support spring 73, which extends out from one side of the sleeve 72.

[0027] like Figure 3 and Figure 4 As shown, a first toothed rod 76 is fixedly installed on one side of the baffle plate 75. The first toothed rod 76 is set in a horizontal state. A gear 77 is meshed at the bottom of the first toothed rod 76. The gear 77 is rotatably installed on the inner wall of the housing 1. A second toothed rod 78 is meshed at the bottom of the gear 77. The second toothed rod 78 is set in a horizontal state. The water baffle 75 moves forward, causing the first rack 76 to move forward synchronously. In turn, the first rack 76 pushes the gear 77 to rotate and simultaneously drives the second rack 78 to move backward.

[0028] like Figure 4 and Figure 5 As shown, a sliding push rod 79 is fixedly installed on one side of the second toothed rod 78. The sliding push rod 79 is slidably installed on the inner wall of the housing 1. The sliding push rod 79 is T-shaped and vertical. A push rod 710 is fixedly installed on one side of the sliding push rod 79 and horizontally. The second rack 78 drives the sliding push rod 79, causing the push rod 710 to move synchronously.

[0029] like Figure 4 and Figure 5As shown, a top sealing plate 711 is fixedly installed on one side of the push rod 710. The top sealing plate 711 is circular. A first sealing plate 712 is provided on one side of the top sealing plate 711. The first sealing plate 712 is vertically arranged and annular. The inner wall of the first sealing plate 712 and the outer wall of the top sealing plate 711 are mutually fitted. A second sealing plate 713 is provided on one side of the first sealing plate 712. The second sealing plate 713 is annular. The inner wall of the second sealing plate 713 and the outer wall of the first sealing plate 712 are mutually fitted. A third sealing plate 714 is provided on one side of the second sealing plate 713. The third sealing plate 714 is annular. The inner wall of the third sealing plate 714 and the outer wall of the second sealing plate 713 are mutually fitted. The push rod 710 moves backward, causing the top sealing plate 711 to move backward synchronously. The top sealing plate 711 creates a gap by being offset from the first sealing plate 712. The first sealing plate 712 is offset from the second sealing plate 713, and the second sealing plate 713 is offset from the third sealing plate 714.

[0030] like Figure 4 and Figure 5 As shown, a rubber sealing ring 715 is provided on one side of the third sealing plate 714. The inner wall of the rubber sealing ring 715 is matched with the outer wall of the third sealing plate 714. The outer wall of the rubber sealing ring 715 is fitted with the inner wall of the water outlet pipe 5. Sliding rods 716 are provided between the top sealing plate 711, the first sealing plate 712, the second sealing plate 713, the third sealing plate 714 and the rubber sealing ring 715. The sliding rods 716 are arranged in a ring at equal intervals. The length of the sliding rods 716 is greater than the distance between the top sealing plate 711, the first sealing plate 712, the second sealing plate 713, the third sealing plate 714 and the rubber sealing ring 715. A fixing plate 717 is provided on the outer wall of the rubber sealing ring 715. The fixing plate 717 is fixedly installed on the inner wall of the water outlet pipe 5. The fixing plate 717 and the outer wall of the rubber sealing ring 715 are staggered. The top sealing plate 711 slides off the inner wall of the first sealing plate 712 via the sliding rod 716. The second sealing plate 713 slides off the inner wall of the second sealing plate 713 via the sliding rod 716. The second sealing plate 713 slides off the inner wall of the third sealing plate 714 via the sliding rod 716. The third sealing plate 714 slides off the rubber sealing ring 715 via the sliding rod 716. That is, the top sealing plate 711, the first sealing plate 712, the second sealing plate 713, the third sealing plate 714 and the rubber sealing ring 715 are evenly separated from each other to form a pagoda shape and create gaps. The fixing plate 717 restricts the outer wall of the rubber sealing ring 715 so that this pagoda shape is located on one side of the water outlet pipe 5, which facilitates the flow of water.

[0031] In practical implementation, when water continuously enters through the inlet pipe 4, the water pressure pushes the baffle plate 75, causing it to move forward and drive the push rod 74, which in turn stretches the support spring 73, extending it from one side of the sleeve 72. The forward movement of the baffle plate 75 causes the first toothed rod 76 to move forward synchronously. This, in turn, drives the gear 77 to rotate and simultaneously drives the second toothed rod 78 to move backward. The second toothed rod 78 drives the sliding push rod 79, causing the push rod 710 to move synchronously. The backward movement of the push rod 710 causes the top sealing plate 711 to move backward synchronously. The top sealing plate 711 slides off the inner wall of the first sealing plate 712 via the sliding rod 716. The second sealing plate 713 is slidably offset from the inner wall of the second sealing plate 713 by the sliding rod 716. The second sealing plate 713 is slidably offset from the inner wall of the third sealing plate 714 by the sliding rod 716. The third sealing plate 714 is slidably offset from the rubber sealing ring 715 by the sliding rod 716. That is, the top sealing plate 711, the first sealing plate 712, the second sealing plate 713, the third sealing plate 714 and the rubber sealing ring 715 are evenly separated from each other to form a pagoda shape and create gaps. The fixing plate 717 restricts the outer wall of the rubber sealing ring 715 so that this pagoda shape is located on one side of the water outlet pipe 5, which facilitates the flow of water. When the water inlet pipe 4 stops flowing, the water pressure on one side of the baffle plate 75 disappears, causing the baffle plate 75 to move back under the elastic tension of the support spring 73. This causes the entire structure to move in the opposite direction, ultimately causing the push rod 710 to move and bring the top sealing plate 711, the first sealing plate 712, the second sealing plate 713, the third sealing plate 714, and the rubber sealing ring 715 closer together. That is, the top sealing plate 711, the first sealing plate 712, the second sealing plate 713, the third sealing plate 714, and the rubber sealing ring 715 fit together to form a vertical circular surface, which fits against the inner wall of the outlet pipe 5, thereby sealing the outlet pipe 5 and preventing the water from flowing back on one side of the outlet pipe 5 and affecting the water meter detection.

[0032] Example 2 In existing technologies, there is no structure that can promptly drain residual water from inside the water meter when the water supply is interrupted. This means that the secondary impact of the residual water's movement and movement on the water meter's readings during a water outage cannot be prevented. To address this problem, the following technical solution is proposed: like Figure 6 and Figure 7As shown, the drainage mechanism 8 includes an opening at the bottom of the housing 1, with a drainage channel 81 connected to the bottom of the opening. The drainage channel 81 is vertically downward. A weight 82 is slidably installed on the inner wall of the drainage channel 81. The top of the weight 82 is flush with the bottom of the housing 1. A through groove 83 is provided on the inner wall of the weight 82. The top of the through groove 83 passes through both sides of the top of the weight 82. A ring pad 84 is provided at the bottom of the weight 82. The ring pad 84 is fixedly installed on the inner wall of the drainage channel 81. The top of the ring pad 84 is in contact with the bottom of the weight 82. A sealing gasket 85 is fixedly installed on the inner wall of the opening at the bottom of the housing 1. The sealing gasket 85 is in contact with the outer wall of the weight 82. The weight 82 inside the drainage channel 81 moves downward naturally due to gravity, and its position is restricted by the ring pad 84.

[0033] like Figure 6 and Figure 7 As shown, two belt hooks 86 are fixedly installed on the top two sides of the weight 82. The two belt hooks 86 are arranged symmetrically and in an inverted L-shape. A lifting plate 87 is provided on one side of the two belt hooks 86. The top of the two lifting plates 87 is sloped. The two lifting plates 87 and the two belt hooks 86 are mutually coordinated. A belt fixing strip 88 is fixedly installed on the outer wall of the two lifting plates 87. The belt fixing strip 88 is fixedly installed on the bottom outer wall of the first toothed rod 76. The distance between the lifting plate 87 and the belt hook 86 is less than the length of the meshing part of the first toothed rod 76 and the gear 77. When the first toothed rod 76 moves back, it drives the fixed strip 88 to move the two card hooks 86 on both sides synchronously. The two card hooks 86 on both sides approach each other and are pushed up by their inclined surfaces. Then the two card hooks 86 drive the weight 82 to move upward. The weight 82 then extends into the bottom of the housing 1. At the same time, the through groove 83 in the weight 82 is connected to the inside of the housing 1 to facilitate the rapid discharge of water.

[0034] In practice, the weight 82 inside the drainage slot 81 naturally moves downward under gravity, and its position is restricted by the ring pad 84. After the water flow stops inside the housing 1, when the first toothed rod 76 moves back, it drives the fixed strip 88 to move the belt hooks 86 on both sides synchronously. The belt hooks 86 on both sides approach each other and are pushed up by their inclined surfaces. Then the two belt hooks 86 drive the weight 82 to move upward, so that the weight 82 extends into the bottom of the housing 1. At the same time, the through groove 83 inside the weight 82 is connected to the inside of the housing 1, which facilitates the rapid discharge of residual water inside the housing 1 and avoids the secondary impact of the residual water inside the water meter on the water meter detection when the water is cut off.

[0035] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A backflow prevention smart water meter based on a pressure sensor, comprising a housing (1), a dial (2) fixedly mounted on the top of the housing (1), a metering device (3) disposed on the top of the dial (2), an inlet pipe (4) connected to one side of the housing (1), an outlet pipe (5) connected to the other side of the housing (1), and an impeller (6) disposed inside the housing (1), characterized in that, The shell (1) is provided with a layered water blocking mechanism (7) on both sides. The layered water blocking mechanism (7) can be opened by the water flow from the inlet pipe (4) to one side of the outlet pipe (5). When the water flow from the inlet pipe (4) stops, the outlet pipe (5) is closed simultaneously due to the disappearance of pressure. The bottom of the shell (1) is provided with a drainage mechanism (8). The drainage mechanism (8) can be opened directly after the water flow from the inlet pipe (4) stops and connect the bottom of the shell (1) to the outside, so that the residual water in the shell (1) can be discharged directly.

2. The anti-backflow smart water meter based on a pressure sensor according to claim 1, characterized in that: The layered water-blocking mechanism (7) includes a retaining rod (71) fixedly installed on the inner wall of the water inlet pipe (4). A sleeve (72) is fixedly installed at the bottom of the retaining rod (71). The sleeve (72) is set in a horizontal state. A support spring (73) is fixedly installed on the inner wall of the sleeve (72). A push rod (74) is fixedly installed on one side of the support spring (73). The push rod (74) is slidably installed on the inner wall of the sleeve (72). The push rod (74) is set in a horizontal state. A baffle plate (75) is fixedly installed on one side of the push rod (74). The baffle plate (75) is set in a vertical state. The area of ​​the baffle plate (75) is the same as the vertical cross-sectional area of ​​the inner wall of the water inlet pipe (4).

3. The anti-backflow smart water meter based on a pressure sensor according to claim 2, characterized in that: A first toothed rod (76) is fixedly installed on one side of the baffle plate (75). The first toothed rod (76) is set in a horizontal state. A gear (77) meshes with the bottom of the first toothed rod (76). The gear (77) is rotatably installed on the inner wall of the housing (1). A second toothed rod (78) meshes with the bottom of the gear (77). The second toothed rod (78) is set in a horizontal state.

4. A backflow prevention smart water meter based on a pressure sensor according to claim 3, characterized in that: A sliding push rod (79) is fixedly installed on one side of the second toothed rod (78). The sliding push rod (79) is slidably installed on the inner wall of the housing (1). The sliding push rod (79) is T-shaped and vertical. A push rod (710) is fixedly installed on one side of the sliding push rod (79). The push rod (710) is horizontal.

5. A backflow prevention smart water meter based on a pressure sensor according to claim 4, characterized in that: A top sealing plate (711) is fixedly installed on one side of the push rod (710). The top sealing plate (711) is circular. A first sealing plate (712) is provided on one side of the top sealing plate (711). The first sealing plate (712) is vertically arranged and annularly arranged. The inner wall of the first sealing plate (712) and the outer wall of the top sealing plate (711) are mutually fitted. A second sealing plate (713) is provided on one side of the first sealing plate (712). The second sealing plate (713) is annularly arranged. The inner wall of the second sealing plate (713) and the outer wall of the first sealing plate (712) are mutually fitted. A third sealing plate (714) is provided on one side of the second sealing plate (713). The third sealing plate (714) is annularly arranged. The inner wall of the third sealing plate (714) and the outer wall of the second sealing plate (713) are mutually fitted.

6. A backflow prevention smart water meter based on a pressure sensor according to claim 5, characterized in that: A rubber sealing ring (715) is provided on one side of the third sealing plate (714). The inner wall of the rubber sealing ring (715) is matched with the outer wall of the third sealing plate (714). The outer wall of the rubber sealing ring (715) is fitted with the inner wall of the water outlet pipe (5). A sliding rod (716) is provided between the top sealing plate (711), the first sealing plate (712), the second sealing plate (713), the third sealing plate (714), and the rubber sealing ring (715). 16) Arranged in a ring at equal intervals, the length of the sliding rod (716) is greater than the distance between the top sealing plate (711), the first sealing plate (712), the second sealing plate (713), the third sealing plate (714) and the rubber sealing ring (715). The outer wall of the rubber sealing ring (715) is provided with a fixing plate (717). The fixing plate (717) is fixedly installed on the inner wall of the water outlet pipe (5). The fixing plate (717) and the outer wall of the rubber sealing ring (715) are arranged in an alternating manner.

7. A backflow prevention smart water meter based on a pressure sensor according to claim 3, characterized in that: The drainage mechanism (8) includes an opening at the bottom of the housing (1), the bottom of which is connected to a drainage groove (81). The drainage groove (81) is vertically downward. A weight (82) is slidably installed on the inner wall of the drainage groove (81). The top of the weight (82) is flush with the bottom of the housing (1). A through groove (83) is provided on the inner wall of the weight (82). The top of the through groove (83) passes through both sides of the top of the weight (82). A ring pad (84) is provided at the bottom of the weight (82). The ring pad (84) is fixedly installed on the inner wall of the drainage groove (81). The top of the ring pad (84) is in contact with the bottom of the weight (82). A sealing gasket (85) is fixedly installed on the inner wall of the opening at the bottom of the housing (1). The sealing gasket (85) is in contact with the outer wall of the weight (82).

8. A backflow prevention smart water meter based on a pressure sensor according to claim 7, characterized in that: The top two sides of the weight (82) are fixedly installed with belt hooks (86), the two belt hooks (86) are symmetrically arranged, the two belt hooks (86) are inverted L shape, one side of the two belt hooks (86) is provided with a lifting plate (87), the top of the two lifting plates (87) is sloping, the two lifting plates (87) and the two belt hooks (86) are mutually cooperated, the outer walls of the two lifting plates (87) are jointly fixedly installed with a belt fixing strip (88), the belt fixing strip (88) is fixedly installed on the bottom outer wall of the first gear (76), the distance between the lifting plate (87) and the belt hook (86) is less than the length of the meshing part of the first gear (76) and the gear (77).

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